Field Testing Of Posrv Assembly; Field Test Connection; Pilot Valve Tester; Hydrostatic Testing And Gagging - GE Baker Hughes 2900-40 Series Maintenance Manual

XX. Setting and Testing (Cont.)
E. Field Testing of POSRV Assembly
E.1 Field Test Connection
A 1/4" FNPT field test connection (Figure 40) is standard on all
pilot valve types. This allows the stroking of the valve with an
auxiliary media, e.g. air or nitrogen. An internal check valve is
present in the field test connection isolating the inlet media
from the test media and at the same time, allowing the valve
to open normally in the event of a system overpressurization
during a field test.

Field Test Connection

Pressure
Gauge
Nitrogen
Regulator
Nitrogen Bottle
Figure 40: Typical Field Test Arrangement
E.2 Pilot Valve Tester
The pilot valve test indicator is available for the modulating
and pop action pilot valves. The valve test indicator measures
the set pressure of the pilot, while maintaining pressure on
the main valve dome area; thereby, allowing only the pilot to
actuate. The system shown in Figure 41 is available for remote
or local testing.
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Isolation Valve
Connection to
Valve Test Plug
Vent Valve
Figure 41: Pilot Valve Tester
F. Hydrostatic Testing and Gagging
When hydrostatic tests are required after installation of a
POSRV, remove the POSRV and replace it with a blind flange. If
the hydrostatic test pressure will not be greater than the set
pressure of POSRV, a test gag may be used (see Figure 48 in
Section XXII). Very little force, i.e., hand-tight pressure, on the
test gag is sufficient to hold hydrostatic pressures. Too much
force applied to the gag may bend the spindle and prevent
the pilot from performing correctly. After a hydrostatic test,
the gag must be removed and replaced by the sealing plug
furnished for this purpose.
Consolidated 2900-40 Series POSRV Maintenance Manual | 53